Help beating "Tomb of the Rose Knights"?

I'm a level 6 Shin'hare Cleric, and I am really struggling with this one. I can (normally) get through the first 3 fights pretty easy, but once I get to the King, I just can not seem to break through. I and on my 3rd run so far and I've lost 10 times in a row, even with some of the Stronger cards like [Walking Hive] and [Adaptatron]. I am assuming I just do not have the right Cards.
The most obvious Answer for more, is to grind to level 7, where I could start using Diamond Cards, but I wanted to see if there was a easier option first.

Leveling up your character probably isn't help as much filling out you collection with new character and cards off the AH.

Any suggestions on farming gold or Packs then? I.E What ones should I buy, or does it matter, or where should I go for the best options? etc etc.
Also, has the Starters changed since that was posted? I have almost none of those cards, despite the claim.

Okey, what the heck is going on here. Someone tell me what I am missing. Several of these "Starter Decks" that people are posting (not just here, but just about everywhere I look), are really expensive. like 3000-4000 Plat or 50-100k Gold.
I get that if you want a good deck, you need to be able to pay the cost, but my God, is there really no options for a new player?

Attacking the campaign in a linear fashion is much difficult than a traditional rpg. Difficult even for hex vets.

I'd keep trying new characters. Bunnies need a lot synergies that initial 200 cards don't have. While you are trying out the other classes and races you can save up gold to buy more bunnies or whatever. Or save up to buy the cards for one of Nico's ABT decks and start farming the arena for better gold production.

Okey, what the heck is going on here. Someone tell me what I am missing. Several of these "Starter Decks" that people are posting (not just here, but just about everywhere I look), are really expensive. like 3000-4000 Plat or 50-100k Gold.
I get that if you want a good deck, you need to be able to pay the cost, but my God, is there really no options for a new player?

You're not looking at the new player section... the Hare'icane assumes you have the resources to invest in the card game. If you want to do F2P version, it's at the very bottom. Part Four – Starting from Scratch (F2P).

As for what new players or F2Ps do.... you cannot build a One Deck to Rule Them All on free cards. So you need to adjust your deck for each encounter and modify things to overcome that particular encounter. This means changing your deck constantly and exploiting enemy weaknesses by learning through failure. All the cards you need to complete the campaign are given to you through AZ1 packs, shroom haus, and dungeons. But for any particular encounter, you might need to switch up your strategy to tackle it.

The more expensive decks have excellent synergy within the deck and can steamroll through more of the campaign with that Good Deck specialization.

one strat (not necessarily a good one) is to get his health down QUICK, the more rounds go by the bigger the hit when he transforms, and honestly a good bit of luck. that encounter is one where if you don't get the right draw of hand and cards, meaning almost PERFECT draws, your just gonna die. I love vinetraps with equipment, anything they block gets -2 atk, helps survive the elementals, and if you can buff things to beyond 6 def it helps allot. very challenging encounter.